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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2007
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
6 * Christian Borntraeger (cborntra@de.ibm.com),
7 */
8
9#define KMSG_COMPONENT "cpcmd"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/export.h>
14#include <linux/slab.h>
15#include <linux/spinlock.h>
16#include <linux/stddef.h>
17#include <linux/string.h>
18#include <linux/mm.h>
19#include <linux/io.h>
20#include <asm/diag.h>
21#include <asm/ebcdic.h>
22#include <asm/cpcmd.h>
23#include <asm/asm.h>
24
25static DEFINE_SPINLOCK(cpcmd_lock);
26static char cpcmd_buf[241];
27
28static int diag8_noresponse(int cmdlen)
29{
30 asm volatile(
31 " diag %[rx],%[ry],0x8\n"
32 : [ry] "+&d" (cmdlen)
33 : [rx] "d" (__pa(cpcmd_buf))
34 : "cc");
35 return cmdlen;
36}
37
38static int diag8_response(int cmdlen, char *response, int *rlen)
39{
40 union register_pair rx, ry;
41 int cc;
42
43 rx.even = __pa(cpcmd_buf);
44 rx.odd = __pa(response);
45 ry.even = cmdlen | 0x40000000L;
46 ry.odd = *rlen;
47 asm volatile(
48 " diag %[rx],%[ry],0x8\n"
49 CC_IPM(cc)
50 : CC_OUT(cc, cc), [ry] "+d" (ry.pair)
51 : [rx] "d" (rx.pair)
52 : CC_CLOBBER);
53 if (CC_TRANSFORM(cc))
54 *rlen += ry.odd;
55 else
56 *rlen = ry.odd;
57 return ry.even;
58}
59
60/*
61 * __cpcmd has some restrictions over cpcmd
62 * - __cpcmd is unlocked and therefore not SMP-safe
63 */
64int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
65{
66 int cmdlen;
67 int rc;
68 int response_len;
69
70 cmdlen = strlen(cmd);
71 BUG_ON(cmdlen > 240);
72 memcpy(cpcmd_buf, cmd, cmdlen);
73 ASCEBC(cpcmd_buf, cmdlen);
74
75 diag_stat_inc(DIAG_STAT_X008);
76 if (response) {
77 memset(response, 0, rlen);
78 response_len = rlen;
79 rc = diag8_response(cmdlen, response, &rlen);
80 EBCASC(response, response_len);
81 } else {
82 rc = diag8_noresponse(cmdlen);
83 }
84 if (response_code)
85 *response_code = rc;
86 return rlen;
87}
88EXPORT_SYMBOL(__cpcmd);
89
90int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
91{
92 unsigned long flags;
93 char *lowbuf;
94 int len;
95
96 if (is_vmalloc_or_module_addr(response)) {
97 lowbuf = kmalloc(rlen, GFP_KERNEL);
98 if (!lowbuf) {
99 pr_warn("The cpcmd kernel function failed to allocate a response buffer\n");
100 return -ENOMEM;
101 }
102 spin_lock_irqsave(&cpcmd_lock, flags);
103 len = __cpcmd(cmd, lowbuf, rlen, response_code);
104 spin_unlock_irqrestore(&cpcmd_lock, flags);
105 memcpy(response, lowbuf, rlen);
106 kfree(lowbuf);
107 } else {
108 spin_lock_irqsave(&cpcmd_lock, flags);
109 len = __cpcmd(cmd, response, rlen, response_code);
110 spin_unlock_irqrestore(&cpcmd_lock, flags);
111 }
112 return len;
113}
114EXPORT_SYMBOL(cpcmd);
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2007
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
5 * Christian Borntraeger (cborntra@de.ibm.com),
6 */
7
8#define KMSG_COMPONENT "cpcmd"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/stddef.h>
16#include <linux/string.h>
17#include <asm/ebcdic.h>
18#include <asm/cpcmd.h>
19#include <asm/io.h>
20
21static DEFINE_SPINLOCK(cpcmd_lock);
22static char cpcmd_buf[241];
23
24static int diag8_noresponse(int cmdlen)
25{
26 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
27 register unsigned long reg3 asm ("3") = cmdlen;
28
29 asm volatile(
30#ifndef CONFIG_64BIT
31 " diag %1,%0,0x8\n"
32#else /* CONFIG_64BIT */
33 " sam31\n"
34 " diag %1,%0,0x8\n"
35 " sam64\n"
36#endif /* CONFIG_64BIT */
37 : "+d" (reg3) : "d" (reg2) : "cc");
38 return reg3;
39}
40
41static int diag8_response(int cmdlen, char *response, int *rlen)
42{
43 register unsigned long reg2 asm ("2") = (addr_t) cpcmd_buf;
44 register unsigned long reg3 asm ("3") = (addr_t) response;
45 register unsigned long reg4 asm ("4") = cmdlen | 0x40000000L;
46 register unsigned long reg5 asm ("5") = *rlen;
47
48 asm volatile(
49#ifndef CONFIG_64BIT
50 " diag %2,%0,0x8\n"
51 " brc 8,1f\n"
52 " ar %1,%4\n"
53#else /* CONFIG_64BIT */
54 " sam31\n"
55 " diag %2,%0,0x8\n"
56 " sam64\n"
57 " brc 8,1f\n"
58 " agr %1,%4\n"
59#endif /* CONFIG_64BIT */
60 "1:\n"
61 : "+d" (reg4), "+d" (reg5)
62 : "d" (reg2), "d" (reg3), "d" (*rlen) : "cc");
63 *rlen = reg5;
64 return reg4;
65}
66
67/*
68 * __cpcmd has some restrictions over cpcmd
69 * - the response buffer must reside below 2GB (if any)
70 * - __cpcmd is unlocked and therefore not SMP-safe
71 */
72int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
73{
74 int cmdlen;
75 int rc;
76 int response_len;
77
78 cmdlen = strlen(cmd);
79 BUG_ON(cmdlen > 240);
80 memcpy(cpcmd_buf, cmd, cmdlen);
81 ASCEBC(cpcmd_buf, cmdlen);
82
83 if (response) {
84 memset(response, 0, rlen);
85 response_len = rlen;
86 rc = diag8_response(cmdlen, response, &rlen);
87 EBCASC(response, response_len);
88 } else {
89 rc = diag8_noresponse(cmdlen);
90 }
91 if (response_code)
92 *response_code = rc;
93 return rlen;
94}
95EXPORT_SYMBOL(__cpcmd);
96
97int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
98{
99 char *lowbuf;
100 int len;
101 unsigned long flags;
102
103 if ((virt_to_phys(response) != (unsigned long) response) ||
104 (((unsigned long)response + rlen) >> 31)) {
105 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
106 if (!lowbuf) {
107 pr_warning("The cpcmd kernel function failed to "
108 "allocate a response buffer\n");
109 return -ENOMEM;
110 }
111 spin_lock_irqsave(&cpcmd_lock, flags);
112 len = __cpcmd(cmd, lowbuf, rlen, response_code);
113 spin_unlock_irqrestore(&cpcmd_lock, flags);
114 memcpy(response, lowbuf, rlen);
115 kfree(lowbuf);
116 } else {
117 spin_lock_irqsave(&cpcmd_lock, flags);
118 len = __cpcmd(cmd, response, rlen, response_code);
119 spin_unlock_irqrestore(&cpcmd_lock, flags);
120 }
121 return len;
122}
123EXPORT_SYMBOL(cpcmd);